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net-next: Add netif_get_num_default_rss_queues

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Most multi-queue networking driver consider the number of online cpus when
configuring RSS queues.
This patch adds a wrapper to the number of cpus, setting an upper limit on the
number of cpus a driver should consider (by default) when allocating resources
for his queues.

Signed-off-by: Yuval Mintz <yuvalmin@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Yuval Mintz 2012-07-01 03:18:50 +00:00 • committed by David S. Miller
parent bf5e53e371
commit 16917b87a2
2 changed files with 14 additions and 0 deletions
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3
include/linux/netdevice.h
View file

@ -2119,6 +2119,9 @@ static inline int netif_copy_real_num_queues(struct net_device *to_dev,
#endif #endif
} }
#define DEFAULT_MAX_NUM_RSS_QUEUES (8)
extern int netif_get_num_default_rss_queues(void);
/* Use this variant when it is known for sure that it /* Use this variant when it is known for sure that it
* is executing from hardware interrupt context or with hardware interrupts * is executing from hardware interrupt context or with hardware interrupts
* disabled. * disabled.

11
net/core/dev.c
View file

@ -1793,6 +1793,17 @@ int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq)
EXPORT_SYMBOL(netif_set_real_num_rx_queues); EXPORT_SYMBOL(netif_set_real_num_rx_queues);
#endif #endif
/* netif_get_num_default_rss_queues - default number of RSS queues
*
* This routine should set an upper limit on the number of RSS queues
* used by default by multiqueue devices.
*/
int netif_get_num_default_rss_queues()
{
return min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES, num_online_cpus());
}
EXPORT_SYMBOL(netif_get_num_default_rss_queues);
static inline void __netif_reschedule(struct Qdisc *q) static inline void __netif_reschedule(struct Qdisc *q)
{ {
struct softnet_data *sd; struct softnet_data *sd;